Improvement in machines for gumsviing saws



S.,. P. ULNEY.

Machines for Gumming Saws. 142,173.

Patented August 26, 1873v UNITED STA-Tus SANFORD P. OLNEY, OF DETROIT, MICHIGAN.

IMPROV'EMENTOIN MACHINES FOR GUNIMING SAWS.

Specification forming part of Letters Patent No. 142,123, dated August 26, 1873; application tiled May e, 1873.

` reference marked thereon, and being a part of this specication, in which-- Figure l is a perspective view. Fig. 2 is a plan ortop view. Fig. 3 is an elevation of the adjustable counter-weight. Fig. 4 is a front elevation of the wheel and arm.

Like letters refer to like parts in the several figures.

The nature of this invention relates to an improvement in that class of machines by which the teeth of saws are gummed and sharpened by an emery-wheel revolving at the end of a swinging arm; and has for its objectto so construct such a machine that the arm will have a universal movemcnt-to wit,

a radial movement in avertical plane; a similar movement in a horizontal plane; and an inclination either way from-the vertical plane, the radius of inclination being described from the lowest point ofthe emery-wheel, whereby the teeth of a saw may be ground to any desired form, and gummed to any depth or shape; also, to so construct and apply the counterweight to the arm as to counterbalance the arm in its longitudinal as well as in its transverse axis, when inclined on the former axis, as more fully hereinafter set forth.

In the drawing, A represents the frame of the machine supporting a table, B 5 across the lower back part of the frame a driving-shaft, O, provided with the usual fast and loose pulleys, is journaled. D is a grooved pulley keyed on the drivingshaftmidway between the framestandards. Directly over the pulley D a hollow standard, E, is erected at the back edge of the table, in which is pivoted the stem of a pair of circular bearing-plates, F, the stem having a free rotary movement in its vertical axis. G is a yoke having a circular plate pendent from its center, .which is received between the plates F, forming a hinge or joint therewith by the eyebolt H passing through them, the latter having an eye, a, in its projecting rear end. The yoke oscillates on the bolt H as its axis; its upturned ends carry the boxes b, in which a counter-shaft, I, is journaled, with a grooved pulley, J, keyed on it at the middle, an endless cord, K, passing around it and the driving-pulley D below, the

- driving side of said cord being guided fair to the pulley J by the eye a, through which it passes. Lis an open frame or arm sleeved on the shaft I between the boxes b, carrying, at its projecting rear end, a peculiar counterweight, M, while across its front end an arbor, c, carrying at one end an emery-wheel, N, is journaled in boxes d d. Ll is a handle by which the frame or arm L is operated. O is a cone-pulley on the counter-shaft I; and O is a similar pulley on the arbor c, around both of which a belt, P, passes.

It will now be seen that if the driving-shaft be set in motion, through the two belts, the emery-wheel will be rotated with the arbor c, on which it is mounted, and that the position of the wheel may be adjusted, first, vertically, being raised or lowered on a radius struck from the axis of the counter-shaft I; second, radially on a horizontal plane on the axis of the standard E 5 and, thirdly, it may be inclined from the Vertical plane, as shown by the dotted lines in Fig. 4, the yoke oscillating on its axis the bolt H for that purpose.

Q is a wooden plank or front bolted to the front of the machine-frame, and to each edge is hinged a leaf, Q', both of which may be extended to form a prolongation of the front Q, on the same line, and carry a clamp for securing long mill-saws. To each leaf Q a radiussegment, f, is secured, sliding in a slot in the' side of the frame, in which it may be secured at any point by a set-screw, c. To the front and to each leaf is affixed a removable circular clamp, g, for securing circular saws thereto, in such a manner that the teeth may be successively brought up above the plane of the top edge of the front and leaves, and be subjected to the action of the emery-wheel.

In securing the saw to one of the leaves Q the latter may be swung around toward the side of the frame, so that the teeth may be ground with more or less lem, while, by tilting the arm, the tooth may be sloped to any angle.

For the convenience of the operator the table is provided With a compound guide, composed of a slotted segment, R, secured to the table on a radius from the standard E. A movable standard, S, is secured to the segment R at any point by a set-screw passing through a slot in the latter.

the axis of the bolt H, and may be securely fastened to any inclination laterally by one or more setscrews, t'. The radius of the are T is struck from the axis of the counter-shaft, and it passes through a guideslot, h, in the arm L. L is an adjustable stop on the guide-arc T below the arm, and arrests the descent of the latter at any desired point, and, in gumming saws, regulates the depth of cut. The seg ment It and standard S thus correctly guide the arln at any angle with relation to the vertical pivot, While the inclined arc T governs its movement lat any inclination to which it may be set. In this latter case the tendency of the driving side of the endless cord K to lengthen, or, rather, become slack, is counter acted by the angular extension given it by the eye a of the bolt H, Which always guides it fairly to the groove of the pulley J. U is a met-al shield, which partially incloses the Wheel and protects the workman from the flying particles of the Wheel and abraded metal.

In the ordinary Way of counterweightin g the arnl of such a Wheel, if the arm be inclined so as to bring the wheel out of a vertical plane,

T is a guide-arc pivoted tot, the top of the standard S yon a prolongation of,-x

there is a tendency of the arrn to fall still farther in the direction of such inclination. To overcome this objection, Where the arm is not guided, and, if guided, to prevent it from binding on the guide, I make the top of the counter-Weight an inclined plane, m, Fig. 3, which may be secured to a flat part of the under side of the arm by a screw, n, so that when the guide-arc T is inclined the weight is turned and secured to the arm in a parallel angle, which will throw ont its lower end toward the side opposite the inclination of said arc, and thus counteract the tendency of the arm and Wheel to fall in the direction of their inclination.

W'hat I claim as my invention, and desire to secure by Letters Patent, is

1. The frame A, table B, drivingshaft C, driving-pulley D, standard E, bearing F, yoke G, eyebolt H, counter-shaft I, pulley J, cord K, arm L, arbor c, pulleys O O', and belt I?, combined and arranged substantially as and for the purposes set forth.

2. The counter-Weight M, constructed as described, in combination With the arm L, as shown and set forth.

3. The combination of the slotted segment It and standard S with the guidearc T pivoted thereto, as and for the purpose described.

` SANFORD I). OLNEY.

Witnesses:

H. S. SPRAGUE, H. I1. EBER'rs. 

